No Compromise: Looking for the absolute best performing H11B HID setup? The Morimoto XB HID bulbs will deliver. Compatible with 35W and 55W ballasts: The XB's will produce more lumens, last longer, project farther, and look better doing it.Luminosity: At the heart of the XB H11B bulbs is their perfectly aligned 100% Philips Quartz glass that houses a capsule from APL-USA. Using high quality halide salts from our materials supplier at Messer; the bulbs produce nearly the same luminosity as the industry-standard Osram CBI bulbs at 5500K. No, you're not seeing things here, but yes you will be seeing everything at night.Long Life: The Austrian-sourced Plansee electrodes help keep the bulbs running brighter for longer. Compared to a Philips bulb for example, that will lose 14% of it's luminosity after 200 hours of use, the XB's will lose just 17% but while burning 10% brighter.Precise Alignment: A ribbed sleeve surrounds the base of the glass capsule keeping everything properly lined up, which is even more important than anything else when it comes to HID bulbs. The resulting uniform distribution of light and well-defined beam limits will certainly stand out in comparison.Reliability: Not that we recommend this for any HID bulb, but go ahead and fire it up 100 times in a row or even run it underwater for days at a time and the difference between the XB and any so called "competition" will be clear. Sure, they cost more than a generic HID kit, but the saying "you pay for what you get" has never been more appropriate.Compatibility: The Morimoto XB HID bulbs are a perfect match for the Morimoto XB HID Ballasts, but they can also be used to make the most any pre-existing HID system.